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<p>Numerous methods for evaluating user interfaces have been investigated to develop a metric that incorporates simple task descriptions which can assist designers in organizing their user interface. The metric, Layout Appropriateness (LA), requires a description of the sequences of actions users perform and how frequently each sequence is used. This task description can either be from observations of an existing system or from a simplified task analysis. The appropriateness of a given layout is computed by weighting the cost of each sequence of actions by how frequently the sequence is performed, which emphasizes frequent methods of accomplishing tasks while incorporating less frequent methods in the design. In addition to providing a comparison of proposed or existing layouts, an LA-optimal layout can be presented to the designer. The designer can compare the LA-optimal and existing layouts or start with the LA-optimal layout and modify it to take additional factors into consideration.</p>
layout appropriateness; user interface widget layout; simple task descriptions; Layout Appropriateness; simplified task analysis; weighting; LA-optimal layout; human factors; performance evaluation; software metrics; user interfaces

A. Sears, "Layout Appropriateness: A Metric for Evaluating User Interface Widget Layout," in IEEE Transactions on Software Engineering, vol. 19, no. , pp. 707-719, 1993.
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